using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

namespace BaseGames.World.Map
{
    /// <summary>房间可见性三级状态：未知 / 已踏入 / 已标注（购买地图碎片）。</summary>
    public enum RoomVisibility { Unknown, Explored, Mapped }

    /// <summary>
    /// 地图面板中每个房间对应的格子 UI 组件（架构 15_MapShopModule §1.3）。
    /// <para>同时被 MapPanel（全屏地图）和 MinimapHUD（角落小地图）复用。</para>
    /// 颜色通过 <see cref="SetColors"/> 从外部注入，不在此处硬编码。
    /// <para><see cref="RT"/> 属性在 Awake 中缓存，避免调用方反复 GetComponent。</para>
    /// </summary>
    public class MapRoomCellUI : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        [SerializeField] private Image    _bg;
        [SerializeField] private Image    _icon;
        [SerializeField] private RawImage _outlineImage;  // 可选：房间非矩形轮廓纹理
        [SerializeField] private Image    _highlight;     // 可选：当前房间高亮描边（玩家所在时激活）
        [SerializeField] private Image    _fogOverlay;    // 可选：未知房间雾效覆盖层（R12-FD）

        // 实例颜色（默认值与原硬编码保持一致）；可通过 SetColors 统一覆盖
        private Color _colExplored  = Color.white;
        private Color _colMapped    = new Color(0.45f, 0.45f, 0.45f, 1f);
        private Color _colUnknown   = Color.black;
        private RoomVisibility _currentVisibility;

        private string         _displayName;
        private Action<string> _onHover;
        private Action         _onHoverExit;

        /// <summary>格子的 RectTransform（Awake 中缓存，外部直接访问无需 GetComponent）。</summary>
        public RectTransform RT { get; private set; }

        private void Awake() => RT = GetComponent<RectTransform>();

        /// <summary>
        /// 初始化格子（可见性、图标、Tooltip 回调）。
        /// <para>R11-N8：不再在 Setup 中设置位置/尺寸，调用方按需调用
        /// <see cref="SetGridLayout"/> 或直接操作 <see cref="RT"/>。</para>
        /// </summary>
        public void Setup(MapRoomDataSO room, RoomVisibility visibility, Sprite icon,
                          Action<string> onHover = null, Action onHoverExit = null)
        {
            _displayName = room.DisplayName;
            _onHover     = onHover;
            _onHoverExit = onHoverExit;

            // 房间轮廓纹理（非矩形形状，覆盖在矩形背景上方）
            if (_outlineImage != null)
            {
                _outlineImage.texture = room.RoomOutlineTex;
                _outlineImage.enabled = room.RoomOutlineTex != null;
            }

            SetVisibility(visibility);

            if (_icon != null)
            {
                _icon.sprite  = icon;
                _icon.enabled = icon != null;
            }
        }

        /// <summary>
        /// R11-N8 独立布局接口：根据房间格子坐标与单格像素数设定位置和尺寸。
        /// <para>MapPanel.BuildGrid 与 MinimapHUD.PlaceCell 均通过此接口定位，
        /// 两者互不干扰，消除 Setup 中的重复赋值。</para>
        /// </summary>
        public void SetGridLayout(MapRoomDataSO room, float pixelsPerCell)
        {
            RT.anchoredPosition = new Vector2(room.GridPosition.x * pixelsPerCell,
                                              room.GridPosition.y * pixelsPerCell);
            RT.sizeDelta        = new Vector2(room.GridSize.x     * pixelsPerCell,
                                              room.GridSize.y     * pixelsPerCell);
        }

        /// <summary>覆盖此格子的三级可见性颜色（通常由 MapPanel / MinimapHUD 在创建后统一调用）。</summary>
        public void SetColors(Color explored, Color mapped, Color unknown)
        {
            _colExplored = explored;
            _colMapped   = mapped;
            _colUnknown  = unknown;
            SetVisibility(_currentVisibility); // 用新颜色重新渲染当前状态
        }

        public void SetVisibility(RoomVisibility v)
        {
            _currentVisibility = v;
            if (_bg == null) return;
            _bg.color = v switch
            {
                RoomVisibility.Explored => _colExplored,
                RoomVisibility.Mapped   => _colMapped,
                _                       => _colUnknown,
            };
            // R12-FD 雾效覆盖层：仅在完全未知时显示
            if (_fogOverlay != null)
                _fogOverlay.enabled = v == RoomVisibility.Unknown;
        }

        /// <summary>向后兼容：直接传 bool 时等同于 Explored / Unknown。</summary>
        public void SetDiscovered(bool v)
            => SetVisibility(v ? RoomVisibility.Explored : RoomVisibility.Unknown);

        /// <summary>激活/取消当前房间高亮描边。</summary>
        public void SetHighlight(bool v)
        {
            if (_highlight != null) _highlight.enabled = v;
        }

        /// <summary>
        /// 新发现房间时播放闪白淡出动画（R12-FC）。
        /// 由 MapPanel.OnRoomMappedAnim 调用；协程安全：组件被销毁后 Unity 自动终止。
        /// </summary>
        public IEnumerator PlayRevealAnim(Color flashColor, float duration)
        {
            if (_bg == null) yield break;
            var original = _bg.color;
            _bg.color = flashColor;
            float elapsed = 0f;
            while (elapsed < duration)
            {
                _bg.color = Color.Lerp(flashColor, original, elapsed / duration);
                elapsed  += Time.unscaledDeltaTime;
                yield return null;
            }
            _bg.color = original;
        }

        public void OnPointerEnter(PointerEventData _)
        {
            if (!string.IsNullOrEmpty(_displayName)) _onHover?.Invoke(_displayName);
        }

        public void OnPointerExit(PointerEventData _) => _onHoverExit?.Invoke();
    }
}